LocalCart Connect: A Hyperlocal Marketplace Architecture Using MERN Stack with Geospatial Product Discovery

Abstract

The rapid proliferation of e-commerce platforms has largely overlooked the operational challenges faced by small and medium-scale local retailers who lack digital visibility and technical infrastructure. Existing marketplaces prioritise nationwide logistics and aggregate demand, leaving neighbourhoodvendorsunabletocompeteforproximity-aware buyers who prefer local sourcing. This paper presents LocalCart Connect, a full-stack hyperlocal marketplace developed on the MERN stack (MongoDB, Express.js, React, Node.js) with JWT-based role-separated authentication and MongoDB geospatial indexing for location-aware product discovery.Thesystemsupportsthreeuserroles—buyer,seller, and administrator—each with dedicated workflow interfaces. Sellers publish product listings with real-time inventory management; buyers discover nearby vendors through geospatial filtering and complete purchases through a structured cart-and-checkout flow; administrators manage platformintegritythroughacontroldashboard.Theplatformis deployed on Vercel and tested against 200 simulated concurrent sessions, achieving sub-300 ms API response latency across all core endpoints and 99.2% service availability.Comparativeanalysisagainstexistingmarketplace solutions confirms that LocalCart Connect uniquely combines hyper-localfocus,zerocommissionstructure,structuredseller profiles, and real-time stock visibility in a single deployable open-source system.

Introduction

The document proposes LocalCart Connect, a hyperlocal e-commerce platform designed to address the gap between large-scale online marketplaces and local neighborhood vendors. Traditional platforms like Amazon and Flipkart are optimized for national-level logistics and fail to support nearby, instant, community-based purchasing, leaving small retailers digitally underserved.

The system enables local sellers to register, list products, manage inventory, and handle orders, while buyers can discover items using geospatial (proximity-based) search, add products to a cart, and complete purchases through a structured workflow. It uses a MERN stack (React, Node/Express, MongoDB) with JWT-based role authentication for buyers, sellers, and admins. MongoDB’s 2dsphere indexing enables fast location-based product discovery, while stock updates are handled atomically to avoid overselling.

Performance testing with 200 concurrent users shows that all modules maintain sub-500 ms latency, with geospatial search (~200 ms) and authentication (~80 ms) performing efficiently. Compared to existing platforms, LocalCart Connect uniquely combines hyperlocal discovery, structured seller management, real-time inventory, and zero commission model, making it more suitable for small-scale local commerce.

However, limitations include synthetic testing instead of real user traffic, lack of payment integration (stub only), reliance on seller-entered locations instead of live GPS, absence of rating/review systems, and constraints of free-tier cloud hosting.

Conclusion

This paper presented LocalCart Connect, a full-stack hyperlocalmarketplaceplatformthatbridgesthedigitalaccess gap for small and medium local retailers. The system implements a three-tier MERN stack architecture with MongoDB geospatial indexing for proximity-aware product discovery, JWT-based role-separated authentication, and structured workflows for buyer, seller, and administrator personas.Empiricalevaluationunder200concurrentsimulated users demonstrated sub-300 ms API latency across all core modules and greater than 98.7% service availability. Comparative analysis confirms that LocalCart Connect uniquely combines hyper-local geospatial discovery, zero commissionstructure,structuredsellermanagement,real-time inventory visibility, and open-source extensibility—a combination not offered by any single existing platform surveyed. Future work will focus on integrating a payment gateway for end-to-endtransactionprocessing,addingaproductreviewand rating system, implementing real-time WebSocket notifications,extendingthemobileexperiencethroughaReact Native client, and scaling evaluation to larger concurrent user populations on dedicated database infrastructure.

References

[1] M.FowlerandJ.Lewis,\"Microservices:ADefinitionofThis New Architectural Term,\" martinfowler.com, Mar. 2014. [2] MongoDB,Inc.,\"GeospatialQueries,\"MongoDBManual, 2024. [Online]. Available: https://www.mongodb.com/docs/manual/geospatial-queries/ [3] S. Mitra, R. Paul, andA. Pal, \"Scalable Geospatial Indexing forLocation-BasedCommerceApplications,\"inProc.IEEEInt. Conf.onCloud ComputingandBigDataAnalysis(ICCCBDA), 2022, pp. 118–124. [4] M.Jones,J.Bradley,andN.Sakimura,\"JSONWebToken (JWT),\" IETF RFC 7519, May 2015. [5] R.FieldingandJ.Reschke,\"HypertextTransferProtocol (HTTP/1.1): Authentication,\" IETF RFC 7235, Jun. 2014. [6] K.BharatiandA.Berg,\"Technology Adoption Barriersin SmallBusinessE-Commerce:ASystematicReview,\"J.Small Business Management, vol. 59, no. 4, pp. 1102–1128, 2021.

Copyright

Copyright © 2026 A. Tamizhselvi , U. Mohamed Yousuff, S. Mohamed Riswan, Ramanujam S, M. Thiruselvan. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.